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Theorem tfrcldm 6331
Description: Recursion is defined on an ordinal if the characteristic function satisfies a closure hypothesis up to a suitable point. (Contributed by Jim Kingdon, 26-Mar-2022.)
Hypotheses
Ref Expression
tfrcl.f  |-  F  = recs ( G )
tfrcl.g  |-  ( ph  ->  Fun  G )
tfrcl.x  |-  ( ph  ->  Ord  X )
tfrcl.ex  |-  ( (
ph  /\  x  e.  X  /\  f : x --> S )  ->  ( G `  f )  e.  S )
tfrcl.u  |-  ( (
ph  /\  x  e.  U. X )  ->  suc  x  e.  X )
tfrcl.yx  |-  ( ph  ->  Y  e.  U. X
)
Assertion
Ref Expression
tfrcldm  |-  ( ph  ->  Y  e.  dom  F
)
Distinct variable groups:    f, G, x    S, f, x    f, X, x    f, Y, x    ph, f, x
Allowed substitution hints:    F( x, f)

Proof of Theorem tfrcldm
Dummy variables  z  a  b  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 tfrcl.yx . . 3  |-  ( ph  ->  Y  e.  U. X
)
2 eluni 3792 . . 3  |-  ( Y  e.  U. X  <->  E. z
( Y  e.  z  /\  z  e.  X
) )
31, 2sylib 121 . 2  |-  ( ph  ->  E. z ( Y  e.  z  /\  z  e.  X ) )
4 tfrcl.f . . . 4  |-  F  = recs ( G )
5 tfrcl.g . . . . 5  |-  ( ph  ->  Fun  G )
65adantr 274 . . . 4  |-  ( (
ph  /\  ( Y  e.  z  /\  z  e.  X ) )  ->  Fun  G )
7 tfrcl.x . . . . 5  |-  ( ph  ->  Ord  X )
87adantr 274 . . . 4  |-  ( (
ph  /\  ( Y  e.  z  /\  z  e.  X ) )  ->  Ord  X )
9 tfrcl.ex . . . . 5  |-  ( (
ph  /\  x  e.  X  /\  f : x --> S )  ->  ( G `  f )  e.  S )
1093adant1r 1221 . . . 4  |-  ( ( ( ph  /\  ( Y  e.  z  /\  z  e.  X )
)  /\  x  e.  X  /\  f : x --> S )  ->  ( G `  f )  e.  S )
11 feq2 5321 . . . . . . . 8  |-  ( a  =  x  ->  (
f : a --> S  <-> 
f : x --> S ) )
12 raleq 2661 . . . . . . . 8  |-  ( a  =  x  ->  ( A. b  e.  a 
( f `  b
)  =  ( G `
 ( f  |`  b ) )  <->  A. b  e.  x  ( f `  b )  =  ( G `  ( f  |`  b ) ) ) )
1311, 12anbi12d 465 . . . . . . 7  |-  ( a  =  x  ->  (
( f : a --> S  /\  A. b  e.  a  ( f `  b )  =  ( G `  ( f  |`  b ) ) )  <-> 
( f : x --> S  /\  A. b  e.  x  ( f `  b )  =  ( G `  ( f  |`  b ) ) ) ) )
1413cbvrexv 2693 . . . . . 6  |-  ( E. a  e.  X  ( f : a --> S  /\  A. b  e.  a  ( f `  b )  =  ( G `  ( f  |`  b ) ) )  <->  E. x  e.  X  ( f : x --> S  /\  A. b  e.  x  ( f `  b )  =  ( G `  ( f  |`  b ) ) ) )
15 fveq2 5486 . . . . . . . . . 10  |-  ( b  =  y  ->  (
f `  b )  =  ( f `  y ) )
16 reseq2 4879 . . . . . . . . . . 11  |-  ( b  =  y  ->  (
f  |`  b )  =  ( f  |`  y
) )
1716fveq2d 5490 . . . . . . . . . 10  |-  ( b  =  y  ->  ( G `  ( f  |`  b ) )  =  ( G `  (
f  |`  y ) ) )
1815, 17eqeq12d 2180 . . . . . . . . 9  |-  ( b  =  y  ->  (
( f `  b
)  =  ( G `
 ( f  |`  b ) )  <->  ( f `  y )  =  ( G `  ( f  |`  y ) ) ) )
1918cbvralv 2692 . . . . . . . 8  |-  ( A. b  e.  x  (
f `  b )  =  ( G `  ( f  |`  b
) )  <->  A. y  e.  x  ( f `  y )  =  ( G `  ( f  |`  y ) ) )
2019anbi2i 453 . . . . . . 7  |-  ( ( f : x --> S  /\  A. b  e.  x  ( f `  b )  =  ( G `  ( f  |`  b
) ) )  <->  ( f : x --> S  /\  A. y  e.  x  ( f `  y )  =  ( G `  ( f  |`  y
) ) ) )
2120rexbii 2473 . . . . . 6  |-  ( E. x  e.  X  ( f : x --> S  /\  A. b  e.  x  ( f `  b )  =  ( G `  ( f  |`  b
) ) )  <->  E. x  e.  X  ( f : x --> S  /\  A. y  e.  x  ( f `  y )  =  ( G `  ( f  |`  y
) ) ) )
2214, 21bitri 183 . . . . 5  |-  ( E. a  e.  X  ( f : a --> S  /\  A. b  e.  a  ( f `  b )  =  ( G `  ( f  |`  b ) ) )  <->  E. x  e.  X  ( f : x --> S  /\  A. y  e.  x  ( f `  y )  =  ( G `  ( f  |`  y ) ) ) )
2322abbii 2282 . . . 4  |-  { f  |  E. a  e.  X  ( f : a --> S  /\  A. b  e.  a  (
f `  b )  =  ( G `  ( f  |`  b
) ) ) }  =  { f  |  E. x  e.  X  ( f : x --> S  /\  A. y  e.  x  ( f `  y )  =  ( G `  ( f  |`  y ) ) ) }
24 tfrcl.u . . . . 5  |-  ( (
ph  /\  x  e.  U. X )  ->  suc  x  e.  X )
2524adantlr 469 . . . 4  |-  ( ( ( ph  /\  ( Y  e.  z  /\  z  e.  X )
)  /\  x  e.  U. X )  ->  suc  x  e.  X )
26 simprr 522 . . . 4  |-  ( (
ph  /\  ( Y  e.  z  /\  z  e.  X ) )  -> 
z  e.  X )
274, 6, 8, 10, 23, 25, 26tfrcllemres 6330 . . 3  |-  ( (
ph  /\  ( Y  e.  z  /\  z  e.  X ) )  -> 
z  C_  dom  F )
28 simprl 521 . . 3  |-  ( (
ph  /\  ( Y  e.  z  /\  z  e.  X ) )  ->  Y  e.  z )
2927, 28sseldd 3143 . 2  |-  ( (
ph  /\  ( Y  e.  z  /\  z  e.  X ) )  ->  Y  e.  dom  F )
303, 29exlimddv 1886 1  |-  ( ph  ->  Y  e.  dom  F
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    /\ w3a 968    = wceq 1343   E.wex 1480    e. wcel 2136   {cab 2151   A.wral 2444   E.wrex 2445   U.cuni 3789   Ord word 4340   suc csuc 4343   dom cdm 4604    |` cres 4606   Fun wfun 5182   -->wf 5184   ` cfv 5188  recscrecs 6272
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-iord 4344  df-on 4346  df-suc 4349  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-recs 6273
This theorem is referenced by:  tfrcl  6332  frecfcllem  6372  frecsuclem  6374
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